PROBLEM TO BE SOLVED: To provide an elastic fiber having excellent elasticity and 1-menthol resistance, capable of being given at a relatively low cost, and capable of being suitably used as a fiber product, and to provide a nonwoven fabric.SOLUTION: This elastic fiber is obtained by using a hydrogenated block copolymer, wherein the copolymer contains structural units A (A is a structural unit consisting mainly of an aromatic vinyl compound monomer unit) and units B (B is a structural unit consisting mainly of a conjugated diene compound monomer unit, wherein a content of vinyl bonds in the conjugated diene compound monomer units is at least 50 wt.% and less than 80 wt.% and at least 80% of double bond residues derived from the conjugated diene monomer units are hydrogenated) in its molecule, a block structure of the copolymer is expressed by A-B-A or (A-B)nX, a content of the units A is 10-50 wt.%, a content of the units B is 90-50 wt.%, and a sum total of the content of the units A and the content of the units B is 100 wt%.COPYRIGHT: (C)2006,JPO&NCIPI【課題】優れた弾性と耐l-メントール性を有し、更に比較的安価で繊維製品としての用途に好適な弾性繊維、弾性不織布を提供すること。【解決手段】分子中に構成単位A、Bを含有し、かつブロック構造がA-B-Aまたは(A-B)nXで表され、Aの含有量が10~50重量%であり、Bの含有量が90~50重量%であり、Aの含有量とBの含有量の和が100重量%である水添ブロック共重合体を用いて得られる弾性繊維による。A:芳香族ビニル化合物モノマー単位を主とする構成単位。B:共役ジエン化合物モノマー単位を主とし、かつ共役ジエン化合物モノマー単位中のビニル結合含量が50重量%以上、80重量%未満である、共役ジエンモノマー単位由来の二重結合残基の80%以上が水添された構成単位。【選択図】なし
